Method for controlling power of transfer signal of direct communication line during soft maintenance transmission

FIELD: mobile communications.

SUBSTANCE: each base station performs independent, but identical algorithms. Selecting device performs the same algorithm for controlling power, as each base station, and coordinates control of power between two base stations and moving station during soft maintenance transmission. Algorithm results generated by selection device are delayed because of back transmission. Selection device provides information to base station about amplification coefficient of graph signal and frame delay, appropriate for amplification coefficient of graph signal. Integral circuit of basic orientation of base station modifies power of base station signal, generated in accordance to data o relation of signal to noise from moving station and data about traffic signal amplification and frame delay, received from selection device.

EFFECT: broader functional capabilities, higher efficiency.

2 cl, 6 dwg

 

I. Scope of the invention

The present invention relates generally to power control direct lines of communication in the mobile communication system multiple access code division ("mdcr") and, in particular, to a power control using the direct channel in the system mdcr.

II. Prior art

Modulation mdcr for use in RF (radio frequency) spectrum for mobile communication is one way in which the communication system serves a large number of users. Technology mdcr improves quality of service by providing reliable operation in environments with sinking and transparent or soft handovers. Soft transfer occurs when the mobile station establishes a connection with the target base station, at the same time, short-supporting connection with the source base station and sometimes with a third base station. When the mobile station moves from its current cell (source cell) to the next cell (target cell), the connection channel traffic simultaneously supported by both cells.

Smooth soft transfer is performed via the mobile station. Figure 1 illustrates direct communication line with a soft transfer, and figure 2 illustrates the reverse line. In a straight line on Vigna station 10 uses the high-water receiver (rake receiver) (not illustrated) for to demodulate two separate signals from two different base stations 12, 14. Two signals are combined to produce a composite signal of the best quality. In the return line in figure 2, the signal transmission of the mobile station 10 is received by both base stations 12, 14. Two cells demodulated signal separately and send the demodulated frames back to the controller 16 of the base station. The controller 16 of the base station ("ASC") contains the device 18 selection, which selects the best frame of two frames that are sent back.

System mdcr performs smooth operation with tight power control. Since all users share the same RF band through the use of PN codes (pseudocode), each user looks like random noise to other users. The capacity of each individual user needs to be carefully managed so that no user too did not create interference to other users that share the same frequency band. This is also true during soft handovers, when the mobile station passes through a return line connection message power control in the base station. The standard IS-95 has determined that the mobile station should communicate back to the base station quality, relatively what about the relationship of signal to noise ratio ("SNR") of the straight line. The mobile station collects statistical data on erroneous functioning about whether it decodes the signals of the base station, and informs the base station through the message power control. The base station then adjusts its power accordingly for a specific user. The symbols transmitted over the forward and reverse channels are formatted into frames, and each frame has a duration of 20 milliseconds. U.S. patent No. 5504773, entitled "Method and apparatus for the formatting of data for transmission", issued April 2, 1996, sets out a more detailed explanation of these frames.

The mobile station updates the power control for frame-by-frame basis. High frequency of update messages, power control allows base stations to fine-tune their transmission power for each mobile station, supporting their transmit power to the minimum level required to support the communication line, thus minimizing the overall noise of the system and improving system throughput. The process frame-based power control is disclosed in U.S. patent No. 5383219, entitled "Fast power control direct lines of communication in multiple access, code-division", the disclosure of which is included in the us is Aasee description as a reference, as if it were fully set forth in this invention.

Device selection is responsible for the processing requirements of the base station. Device select ground network determines the speed of the traffic, with which the frame is sent to the mobile station, and sends the frame to all base stations that communicate with a particular mobile station. The number of bits per frame transmitted on the reverse channel is changed in accordance with the speed of traffic. A more detailed description of the speed of traffic will be provided below.

During the soft transfer of multiple base stations transmit the frame to a mobile station. After merging the data from the possible set of base stations the mobile station determines whether the received and decoded the last frame. If the mobile station was correctly decoded the last frame, the mobile station sends bits of power control in the next frame, which is transmitted to the base station. Device selection controls and synchronizes the communication when multiple base stations simultaneously interact with the mobile station. Because the device knows the rate, with which the base station transmitted the last frame of the mobile station, and now have feedback from the mobile station relative to the CSOs, have been properly decoded the frame, the device selection is a table of statistical data regarding the frequency of errors experienced by the mobile station for each transmission speed. As an example, for a given transmission speed of the traffic device calculates the frequency error "E1".

The device determines the power level or gain of signal traffic that should be transmitted in the next frame, by comparing with zero corresponding to the newly calculated difference. For example, if the frame must be transmitted with full speed and E1>0, the power level equal to Ρrated+ Ρwhere Ρ - function of the value of E1 and Ρrated- the power level set by the carrier for a given geographic area. If E1=0, the power level equal to Ρrated. If E1<0, the power level must be equal to Ρrated- Ρ. The device sends the next frame transmitted in a mobile station, base stations, which communicate with the mobile station. An indication of the power level, which must be transmitted the frame is included with this frame.

The problem with the type of power control described above is that there is a delay between the time when the device select calc the em gain signal traffic and when the gain of the signal traffic is transmitted in the base station and is programmed in an integrated circuit applied orientation ("USE"). Each base station device perform the same algorithms for power control, but the result of the algorithm is the device of choice is delayed due to a postback.

During the operation of the soft transfer of one of the base stations communicating with the mobile station may receive an erroneous signal SNR (ratio of signal to noise ratio) of the mobile station or may not receive any control signal from the mobile station. Because the signal power control in the forward channel transmitted with a high transmission rate, the base station may transmit with undesirable high or low power level over several frames before receiving the most reliable gain signal traffic from the device selection. If the base station transmits at a high power level, the General disturbance of the system increases. If the base station transmits with low power level, then the transmission quality deteriorates.

The invention

There is an urgent need in the way with which the device provides the base station with information about coefficie is the gain of the signal traffic and the delay frame, corresponding to this coefficient, so as to compensate for the delay due to the reverse passage.

The present invention is a device in which the algorithm of power control performed by the device, determines and transmits the most reliable gain traffic signal for each base station during the operation of the soft transfer service. In addition, the device sends each base station information frame delay corresponding to the amplification factor of signal traffic. The mobile station measures and sends the data to the signal-to-noise, not information about the frequency of errors. USE the base station modifies the power of the transmission signal from the base station, in accordance with the data SNR adopted from the mobile station, and information gain signal traffic and the frame delay, adopted from the device selection. Both base stations simultaneously execute a control algorithm power. When the team gain of the signal sent from the device selecting one of the base stations, late, a soft transfer may be accompanied by noise or broken. In this case, DSP (digital signal processor) inserts the desired gain in the previous frame is selected according to the accordance with information delay, and re-introduce after all adjustments and, thus, re-synchronizes the information gain of the device of choice for both base stations.

The invention uses the buffer sliding window in order to hear the signal power control. In this regard, ISOE tracks adjustment, when it receives the correct signal from a controller or base station device of choice.

Brief description of drawings

In the accompanying drawings:

figure 1 depicts a direct line of communication to the mobile station, the source base station and target base station during the operation of the soft transfer service;

figure 2 depicts the reverse connection line to the mobile station, the source base station and target base station during the operation of the soft transfer service;

figure 3 - timing diagram depicting an example of the synchronization signals of the power control channel traffic received and transmitted between the mobile station, base stations and base station controller during the operation of the soft transfer service in the communication system mdcr depicted in figure 4;

figure 4 illustrates the route the return line connection in the architecture mdcr depicting the communication between the mobile station, the source and target base stations and make the your choice during the operation of the soft transfer service;

figure 5 illustrates the control signals direct power line connection during the operation of the soft transfer service;

6 depicts the return line after the device has chosen gain power for base stations.

Detailed description of the invention

The symbols transmitted in the forward and reverse channels are formatted into frames, and each frame has a duration of 20 milliseconds. The amount of data transmitted in each frame depends on the data rate. Each frame contains an external alarm in the reverse channels. When the power control direct channel, the mobile station sends the necessary change in direct SNR, external to the backward channel.

Figure 3 illustrates a frame signal processing SNR and signal power control between the mobile station 10, the base stations 12, 14 and the controller 16 of the base station or device 18 of choice during the operation of the soft transfer service. Each period T, T+1, and so on, time is a frame of transmitted information. It should be noted that although the signal SNR in the following example, is transmitted once per frame, updates the SNR by means of radio waves from the mobile station can be sent more often than once per frame, and more often than updates between the controller 16 of the base is th station and the device 18 of choice. The following is an example of a scenario in which the present invention is applicable.

At time T the mobile station 10 determines the average value of SNR of 110 to gain direct channel. At time T+1 the mobile station 10 transmits 112 Y signal of the Delta-SNR corresponding to the difference between the SNR of the direct channel and the required SNR of the direct channel, in both base stations 12, 14. The signal of the Delta-SNR gives a command to the base stations, which they must pass with gain Υincreasefor optimal power control for the mobile station. Also at time T+1 the source base station 12 receives the signal Y 114 Delta SNR. However, assume that the target base station 14 receives the wrong signal X Delta-SNR or does not receive any signal 116. At time T+2, the controller 16 of the base station receives the signal Y 118 Delta-SNR sent 115 from a source base station 12, and the error signal X 118 sent 117 from the target base station 14. The device 18 of choice (not depicted in figure 4) or the controller 16 of the base station accepts both values of gain and determines the amount of gain, which must pass each base station. Assume in this example that the optimal gain value corresponds to the signal of the Delta-SNR and R is UPE Υ increase. Then the device 18 of choice transmits the command Υteamin each base station, instructing the base station to send traffic with gain Υincrease118. After time T+2 source base station 12 adjusts its gain signal traffic to Υincrease122 and the target base station 14 adjusts its gain signal traffic to Χincrease120. At time T+4 base stations 12, 14 took control signal Υteam122 gain traffic signal from the controller 16 of the base station and each transmits with a power level Υincrease124, 126. However, because of the postback one of the base stations 12, 14 can receive new information about the gain later than the other. Since both base stations simultaneously executing the same control algorithm, command changes the gain becomes unsynchronized on a frame-by-frame basis. In order to exclude the situation in which the base stations are synchronized and transmit to inconsistent power levels, information about the frame delay is also included with information about the gain.

The base station 12, 14 will use the information about the delay frame and the information about the gain and set the gain at time T+2 is equal to Υ increase. Using the information about the delay of the frame, the base station 12, 14 again apply any adjustments from time T+2 and beyond. Thus, each base station 12, 14 re-synchronized with the corresponding gain. Therefore, the same frame of data that is sent and received from mobile station 10 to each base station 12, 14, as desired consistent and does not breakdown during the soft transfer service.

It should be noted that in this illustrative example, the synchronization frame is not rigid. For example, the controller 16 of the base station can receive the signal Υ 114 errors from the source base station 12 at the time, or more than one frame later than T+3. Similarly, the base station 12, 14 can receive signals 120, 122 management traffic from the base station controller and to transmit at a power level of Υincrease124, 126 during, or more than one frame later than T+4.

Figures 4-6 illustrate the scenario where inconsistent signals power control is accepted in the source base station 12 and the target base station 14. Continuing the previous example, assume that the mobile station 10 sends a signal Υ 114 SNR in the source base station 12. The source base station 12 responds by adjusting its transmit power on the Υ Increase122. The mobile station 10 transmits the signal Y 112 SNR in the target base station 14. Assume that the target base station receives the signal SNR as X 116 or may not accept any erroneous signal. The target base station 14 responds by adjusting its transmit power up to Χincrease120.

During the soft transfer service controller 16 or base station device 18 selection synchronizes the control source base station 12 and the target base station 14. To realize this control, the source base station 12 sends a signal Υ 115 SNR and the target base station 14 sends its signal Χ 117 SNR in the device 18 of choice. The device 18 choosing passes in the source base station 12 and the target base station 14 selected level Υincreasetransmit power corresponding to the most reliable signal SNR. In this example, the device determines that the signal Υ SNR is more reliable and, therefore, sends a control signal Υteam. 124, 126 in order to give the command for each base station to transfer from the gain signal traffic Υincrease. When one base station receives the adjustment of the gain of one or more frames later than the other base what I station, the signal on the delay of the frame is also included. The frame delay is determined either statistically or by using the timestamp of the message (not illustrated). USE the base station resets the power level at the appropriate time or in the appropriate frame and re-uses the signals with the adjusted gain in each frame after the first adjusted frame. Thus, base stations transmit with the same power Υincreasein the mobile station 10, and MODULATING the respective base stations are synchronized.

The previous description of the preferred embodiments presented to enable a person skilled in the art to make or use the present invention. Various modifications of these embodiments obvious to a person skilled in the art, and the basic principles defined in the present description may be applicable in other variants of implementation without the use of inventive ability. Thus, the present invention is not limited implementation, reflected in the present description, and must comply with the General framework that is consistent with the principles and new features disclosed in the present description. The frame is subramania must be defined by the attached claims and allowable equivalents, instead of the given examples.

1. The mobile communication system having a frame-by-frame power control containing the mobile station, the set of base stations and the device of choice, able to control and synchronize the communication between the said multiple base stations and said mobile station, the mentioned mobile station is adapted to transmit the signal of the signal-to-noise based on the power level of the signal of the direct channel in said set of base stations on the reverse link, each of these base stations is capable of transmitting the said signal, the signal-to-noise ratio in the above-mentioned device, and the said device is adapted to transmit the command changes the amplification factor the transmission corresponding to the above signal, the signal-to-noise and signal information about the delay frame, and each of these base stations is adapted to adjust the gain in accordance with the above command changes the gain, in this case, each base station transmits communication signals in the above-mentioned mobile station with the required power level in synchronized frames, and in which each of these base stations is adapted to make is to adjust the gain, by adjustment of the gain in the previously transmitted frame in accordance with said delay frame, and re-uses the adjusted gain in all frames following the mentioned previously transmitted frame, the gain of the base station for the said multiple base stations simultaneously communicating with said mobile station will be synchronized.

2. The mobile communication system according to claim 1, in which the said signal is the signal-to-noise is transmitted through the outer channel.

3. The mobile communication system according to claim 1, which additionally mentioned many base stations contains the source base station and target base station, the said device of choice, able to control and synchronize the communication between the said source base station, referred to the target base station and said mobile station, the mentioned mobile station is adapted to transmit the signal of the signal-to-noise based on the power level of the signal of the direct channel in said source base station and said target base station, with reference to the said base station and said target base station, each adapted to adjust the gain according to the under mentioned signal the signal-to-noise and referred to the source base station and said target base station is able to transmit the said signal, the signal-to-noise ratio in the above-mentioned device, and the said device is adapted to transmit the command to change the gain in the transmission corresponding to the above signal, the signal-to-noise and signal information about the delay of the frame in the above-mentioned target base station, with reference to the said base station and said target base station, each adapted to adjust the gain in accordance with the above command changes the gain in the transmission, in which each of the said source and said target base stations transmits communication signals in the above-mentioned mobile station with the required power level in synchronized frames, and referred to the source base station and said target base station using the information about the delay of the frame to adjust the gain and to insert the corrected gain of at least one previously transmitted frame, and re-transmit any frames previously transmitted erroneous gain following the mentioned at least one previously transmitted frame.

4, the mobile communication System according to claim 3, in which mentioned mobile station communicating with said source base station may switch from interaction with said source base station on said target base station with minimal disruption to the quality of the signal.

5. The mobile communication system according to claim 3, in which the mentioned mobile station simultaneously interacting with the said source base station and said target base station, adapted to calculate the average ratio of signal to noise ratio on the basis of the received communication signals in a direct channel of said target and said source base station, and mentioned mobile station is adapted to transmit a signal referred to average the signal-to-noise in the return line in said source base station and said target base station, with reference to the said base station and said target base station adapted to to adjust the gain in accordance with said signal average the signal-to-noise, and referred to the source base station and said target base station is adapted to transmit the said signal, the signal-to-noise ratio in the above-mentioned device, the above-mentioned devices, the choice is capable of transmitting command changes the gain in the transmission, corresponding to the above signal on the average signal-to-noise and signal information frame delay mentioned in the source base station and said target base station, with reference to the said base station and said target base station is adapted to adjust the gain in accordance with the above command changes the gain in the transmission, in which each of these source and target base stations transmits the communication signals in the above-mentioned mobile station with the required power level in synchronized frames, and referred to the source base station and said target base station is adapted to adjust the gain by adjustment of the gain in the previously transmitted frame in accordance with said delay frame, and re-use the adjusted gain in all frames following the mentioned previously transmitted frame, the gain of the base station for the said multiple base stations simultaneously communicating with said mobile station will be synchronized, and mentioned mobile station communicating with said source base station may switch from the EOI is to interact with the said source station to the mentioned target station with minimal disruption to the quality of the signal.

6. The method of providing frame data in the mobile communication system with multiple base station device and mobile station, and the method comprises the steps: receive the communication signals in the above-mentioned mobile station from more than one of the said multiple base stations on the direct channel, transmit the information of the signal-to-noise direct channel through a return line of the above-mentioned mobile station in more than one of the said multiple base stations, and referred to information about the signal-to-noise corresponds to the power level of the first middle relationship of signal to noise ratio, received from the said multiple base stations that simultaneously interact with said mobile station, transmit the information of the relationship of signal to noise ratio of each base station in the above-mentioned device, determined in the above-mentioned device selection based on the aforementioned information, the signal-to-noise direct channel to the desired gain of the station, provide for each base station mentioned the desired gain and the delay of the frame corresponding to the aforementioned desired power level, and adjust the transmit power of the base station in the following frames in accordance with said demand is m gain and the corresponding frame delay, at this stage adjustment mentioned desired gain of the base station includes a step whereby carry out the adjustment of the gain in the previously transmitted frame in accordance with the aforementioned frame delay and re-use the adjusted gain in all frames following the mentioned previously transmitted frame, the gain of the base station for the said multiple base stations simultaneously communicating with said mobile station will be synchronized.

7. The method according to claim 6 in which the said steps performed during the operation of the soft transfer service.

8. The method according to claim 6, further comprising stages: accept communication signals in the above-mentioned mobile station from the first and second base stations of the said multiple base stations, calculates the signal of the second medium the signal-to-noise ratio, on the basis of the above-mentioned communication signals received from the aforementioned first and second base stations respectively transmit the said signal of the second medium the signal-to-noise in each of the aforementioned first and second base stations, each base station sends its signal to the second medium the signal-to-noise ratio in the above-mentioned device, specify the device of choice is C two mentioned received signals the average relationship of signal to noise ratio from each base station most reliable signal average the signal-to-noise ratio and calculate the required gain of the base station, supply at the above-mentioned first and second base station mentioned the most reliable gain, adjust the gain traffic each base station in accordance with these most reliable power level adopted in the above-mentioned device of choice, and provide information about the delay of the frame of the mentioned devices, when the signal mentioned the most reliable gain transmitted to the base station, is delayed, the phase adjustment of the above-mentioned gain traffic of the base station includes a step of adjusting the gain in the previously transmitted frame in accordance with the aforementioned frame delay and re-applying appropriate gain in all frames, the following for the previously transmitted frame.



 

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